Effect of soil moisture on seasonal variation in indoor radon concentration: modelling and measurements in 326 Finnish houses
Effect of soil moisture on seasonal variation in indoor radon concentration: modelling and measurements in 326 Finnish houses
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DOI：
10.1093/rpd/ncv182
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发表时间：
2016-02-01
影响因子：
1
通讯作者：
Hanninen, P.
中科院分区：
文献类型：
--
作者：
Arvela, H.;Holmgren, O.;Hanninen, P.
研究了土壤湿度对土壤空气和室内氡的季节变化的影响。本文简要回顾了土壤湿度对土壤气氡影响的理论。理论估算和10年土壤水分观测结果表明，土壤水分的变化是影响土壤空气氡浓度季节变化的重要因素。氡气在土壤孔隙水和空气之间的分配是增加土壤空气氡浓度的主要因素。在两个示例测试站点上，计算的月平均土壤空气氡浓度的相对标准偏差为17%和26%。融雪后，秋季和春季土壤湿度增加，使土壤气氡浓度增加10- 20%。2月和3月土壤气氡浓度最低。土壤温度也是一个重要因素。夏季土壤温度升高使计算的土壤气氡浓度比冬季增加了14%。每月室内氡测量超过1年期间在326芬兰的房子，并与模拟结果进行比较。该模型考虑到氡的进入，气候和空气交换。秋季和春季测得的氡气浓度高于预期，这可以用土壤湿度的季节变化来解释。土壤湿度的变化是一个潜在的因素，显着影响到高的年或季节平均氡浓度的年与年之间的变化，在许多氡研究中观察到。
The effect of soil moisture on seasonal variation in soil air and indoor radon is studied. A brief review of the theory of the effect of soil moisture on soil air radon has been presented. The theoretical estimates, together with soil moisture measurements over a period of 10 y, indicate that variation in soil moisture evidently is an important factor affecting the seasonal variation in soil air radon concentration. Partitioning of radon gas between the water and air fractions of soil pores is the main factor increasing soil air radon concentration. On two example test sites, the relative standard deviation of the calculated monthly average soil air radon concentration was 17 and 26 %. Increased soil moisture in autumn and spring, after the snowmelt, increases soil gas radon concentrations by 10-20 %. In February and March, the soil gas radon concentration is in its minimum. Soil temperature is also an important factor. High soil temperature in summer increased the calculated soil gas radon concentration by 14 %, compared with winter values. The monthly indoor radon measurements over period of 1 y in 326 Finnish houses are presented and compared with the modelling results. The model takes into account radon entry, climate and air exchange. The measured radon concentrations in autumn and spring were higher than expected and it can be explained by the seasonal variation in the soil moisture. The variation in soil moisture is a potential factor affecting markedly to the high year-to-year variation in the annual or seasonal average radon concentrations, observed in many radon studies.